Instruction manual

VHS-4, VHS-6 and VHS-250 Diffusion Pumps
D R A F T 6 / 1 8 / 1 3
27
Table 1-4 lists the VHS-250 dimensions.
Table 1-4 VHS-250 Dimensions
ISO
in mm
Height 22.79 579
Centerline to Centerline 13.38 340
Flange Face to Flange Face 9.56 243
Electrical Box Height 9.12 232
Sight Glass,
Degrees from Foreline
90° clockwise
Electrical Box,
Degrees from Foreline
30° counterclockwise
Inlet Flange, Nominal Size ISO - 250F
Inlet Flange, OD 13.19 335
Inlet Flange, ID 10.75 273
Inlet Flange, Thickness 0.63 16
Inlet Flange, Bolt Circle 12.205 310
Inlet Flange, Number of Holes 12
Inlet Range, Hole Size 0.44 11
O-ring Groove ID 10.95 278
O-ring Groove Width 0.14 4
Foreline Flange, Nominal Size 1½ ASA
OD 5.00 127
ID 1.88 48
Thickness 0.62 16
Bolt Circle 3.88 99
Number of Holes 4
Hole Size 0.62 16
O-ring Groove ID 2.22 56
O-ring Groove Width 0.30 8